1 /* 2 * linux/fs/nfs/callback_xdr.c 3 * 4 * Copyright (C) 2004 Trond Myklebust 5 * 6 * NFSv4 callback encode/decode procedures 7 */ 8 #include <linux/kernel.h> 9 #include <linux/sunrpc/svc.h> 10 #include <linux/nfs4.h> 11 #include <linux/nfs_fs.h> 12 #include <linux/ratelimit.h> 13 #include <linux/printk.h> 14 #include <linux/slab.h> 15 #include <linux/sunrpc/bc_xprt.h> 16 #include "nfs4_fs.h" 17 #include "callback.h" 18 #include "internal.h" 19 #include "nfs4session.h" 20 21 #define CB_OP_TAGLEN_MAXSZ (512) 22 #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ) 23 #define CB_OP_GETATTR_BITMAP_MAXSZ (4) 24 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 25 CB_OP_GETATTR_BITMAP_MAXSZ + \ 26 2 + 2 + 3 + 3) 27 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 28 29 #if defined(CONFIG_NFS_V4_1) 30 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 31 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 32 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 33 4 + 1 + 3) 34 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 35 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 36 #endif /* CONFIG_NFS_V4_1 */ 37 38 #define NFSDBG_FACILITY NFSDBG_CALLBACK 39 40 /* Internal error code */ 41 #define NFS4ERR_RESOURCE_HDR 11050 42 43 typedef __be32 (*callback_process_op_t)(void *, void *, 44 struct cb_process_state *); 45 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *); 46 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *); 47 48 49 struct callback_op { 50 callback_process_op_t process_op; 51 callback_decode_arg_t decode_args; 52 callback_encode_res_t encode_res; 53 long res_maxsize; 54 }; 55 56 static struct callback_op callback_ops[]; 57 58 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp) 59 { 60 return htonl(NFS4_OK); 61 } 62 63 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 64 { 65 return xdr_argsize_check(rqstp, p); 66 } 67 68 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 69 { 70 return xdr_ressize_check(rqstp, p); 71 } 72 73 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes) 74 { 75 __be32 *p; 76 77 p = xdr_inline_decode(xdr, nbytes); 78 if (unlikely(p == NULL)) 79 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n"); 80 return p; 81 } 82 83 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str) 84 { 85 __be32 *p; 86 87 p = read_buf(xdr, 4); 88 if (unlikely(p == NULL)) 89 return htonl(NFS4ERR_RESOURCE); 90 *len = ntohl(*p); 91 92 if (*len != 0) { 93 p = read_buf(xdr, *len); 94 if (unlikely(p == NULL)) 95 return htonl(NFS4ERR_RESOURCE); 96 *str = (const char *)p; 97 } else 98 *str = NULL; 99 100 return 0; 101 } 102 103 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 104 { 105 __be32 *p; 106 107 p = read_buf(xdr, 4); 108 if (unlikely(p == NULL)) 109 return htonl(NFS4ERR_RESOURCE); 110 fh->size = ntohl(*p); 111 if (fh->size > NFS4_FHSIZE) 112 return htonl(NFS4ERR_BADHANDLE); 113 p = read_buf(xdr, fh->size); 114 if (unlikely(p == NULL)) 115 return htonl(NFS4ERR_RESOURCE); 116 memcpy(&fh->data[0], p, fh->size); 117 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 118 return 0; 119 } 120 121 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 122 { 123 __be32 *p; 124 unsigned int attrlen; 125 126 p = read_buf(xdr, 4); 127 if (unlikely(p == NULL)) 128 return htonl(NFS4ERR_RESOURCE); 129 attrlen = ntohl(*p); 130 p = read_buf(xdr, attrlen << 2); 131 if (unlikely(p == NULL)) 132 return htonl(NFS4ERR_RESOURCE); 133 if (likely(attrlen > 0)) 134 bitmap[0] = ntohl(*p++); 135 if (attrlen > 1) 136 bitmap[1] = ntohl(*p); 137 return 0; 138 } 139 140 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 141 { 142 __be32 *p; 143 144 p = read_buf(xdr, NFS4_STATEID_SIZE); 145 if (unlikely(p == NULL)) 146 return htonl(NFS4ERR_RESOURCE); 147 memcpy(stateid, p, NFS4_STATEID_SIZE); 148 return 0; 149 } 150 151 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 152 { 153 __be32 *p; 154 __be32 status; 155 156 status = decode_string(xdr, &hdr->taglen, &hdr->tag); 157 if (unlikely(status != 0)) 158 return status; 159 /* We do not like overly long tags! */ 160 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) { 161 printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n", 162 __func__, hdr->taglen); 163 return htonl(NFS4ERR_RESOURCE); 164 } 165 p = read_buf(xdr, 12); 166 if (unlikely(p == NULL)) 167 return htonl(NFS4ERR_RESOURCE); 168 hdr->minorversion = ntohl(*p++); 169 /* Check for minor version support */ 170 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) { 171 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */ 172 } else { 173 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with " 174 "illegal minor version %u!\n", 175 __func__, hdr->minorversion); 176 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 177 } 178 hdr->nops = ntohl(*p); 179 dprintk("%s: minorversion %d nops %d\n", __func__, 180 hdr->minorversion, hdr->nops); 181 return 0; 182 } 183 184 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 185 { 186 __be32 *p; 187 p = read_buf(xdr, 4); 188 if (unlikely(p == NULL)) 189 return htonl(NFS4ERR_RESOURCE_HDR); 190 *op = ntohl(*p); 191 return 0; 192 } 193 194 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) 195 { 196 __be32 status; 197 198 status = decode_fh(xdr, &args->fh); 199 if (unlikely(status != 0)) 200 goto out; 201 args->addr = svc_addr(rqstp); 202 status = decode_bitmap(xdr, args->bitmap); 203 out: 204 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 205 return status; 206 } 207 208 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) 209 { 210 __be32 *p; 211 __be32 status; 212 213 args->addr = svc_addr(rqstp); 214 status = decode_stateid(xdr, &args->stateid); 215 if (unlikely(status != 0)) 216 goto out; 217 p = read_buf(xdr, 4); 218 if (unlikely(p == NULL)) { 219 status = htonl(NFS4ERR_RESOURCE); 220 goto out; 221 } 222 args->truncate = ntohl(*p); 223 status = decode_fh(xdr, &args->fh); 224 out: 225 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 226 return status; 227 } 228 229 #if defined(CONFIG_NFS_V4_1) 230 231 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp, 232 struct xdr_stream *xdr, 233 struct cb_layoutrecallargs *args) 234 { 235 __be32 *p; 236 __be32 status = 0; 237 uint32_t iomode; 238 239 args->cbl_addr = svc_addr(rqstp); 240 p = read_buf(xdr, 4 * sizeof(uint32_t)); 241 if (unlikely(p == NULL)) { 242 status = htonl(NFS4ERR_BADXDR); 243 goto out; 244 } 245 246 args->cbl_layout_type = ntohl(*p++); 247 /* Depite the spec's xdr, iomode really belongs in the FILE switch, 248 * as it is unusable and ignored with the other types. 249 */ 250 iomode = ntohl(*p++); 251 args->cbl_layoutchanged = ntohl(*p++); 252 args->cbl_recall_type = ntohl(*p++); 253 254 if (args->cbl_recall_type == RETURN_FILE) { 255 args->cbl_range.iomode = iomode; 256 status = decode_fh(xdr, &args->cbl_fh); 257 if (unlikely(status != 0)) 258 goto out; 259 260 p = read_buf(xdr, 2 * sizeof(uint64_t)); 261 if (unlikely(p == NULL)) { 262 status = htonl(NFS4ERR_BADXDR); 263 goto out; 264 } 265 p = xdr_decode_hyper(p, &args->cbl_range.offset); 266 p = xdr_decode_hyper(p, &args->cbl_range.length); 267 status = decode_stateid(xdr, &args->cbl_stateid); 268 if (unlikely(status != 0)) 269 goto out; 270 } else if (args->cbl_recall_type == RETURN_FSID) { 271 p = read_buf(xdr, 2 * sizeof(uint64_t)); 272 if (unlikely(p == NULL)) { 273 status = htonl(NFS4ERR_BADXDR); 274 goto out; 275 } 276 p = xdr_decode_hyper(p, &args->cbl_fsid.major); 277 p = xdr_decode_hyper(p, &args->cbl_fsid.minor); 278 } else if (args->cbl_recall_type != RETURN_ALL) { 279 status = htonl(NFS4ERR_BADXDR); 280 goto out; 281 } 282 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n", 283 __func__, 284 args->cbl_layout_type, iomode, 285 args->cbl_layoutchanged, args->cbl_recall_type); 286 out: 287 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 288 return status; 289 } 290 291 static 292 __be32 decode_devicenotify_args(struct svc_rqst *rqstp, 293 struct xdr_stream *xdr, 294 struct cb_devicenotifyargs *args) 295 { 296 __be32 *p; 297 __be32 status = 0; 298 u32 tmp; 299 int n, i; 300 args->ndevs = 0; 301 302 /* Num of device notifications */ 303 p = read_buf(xdr, sizeof(uint32_t)); 304 if (unlikely(p == NULL)) { 305 status = htonl(NFS4ERR_BADXDR); 306 goto out; 307 } 308 n = ntohl(*p++); 309 if (n <= 0) 310 goto out; 311 if (n > ULONG_MAX / sizeof(*args->devs)) { 312 status = htonl(NFS4ERR_BADXDR); 313 goto out; 314 } 315 316 args->devs = kmalloc(n * sizeof(*args->devs), GFP_KERNEL); 317 if (!args->devs) { 318 status = htonl(NFS4ERR_DELAY); 319 goto out; 320 } 321 322 /* Decode each dev notification */ 323 for (i = 0; i < n; i++) { 324 struct cb_devicenotifyitem *dev = &args->devs[i]; 325 326 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE); 327 if (unlikely(p == NULL)) { 328 status = htonl(NFS4ERR_BADXDR); 329 goto err; 330 } 331 332 tmp = ntohl(*p++); /* bitmap size */ 333 if (tmp != 1) { 334 status = htonl(NFS4ERR_INVAL); 335 goto err; 336 } 337 dev->cbd_notify_type = ntohl(*p++); 338 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE && 339 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) { 340 status = htonl(NFS4ERR_INVAL); 341 goto err; 342 } 343 344 tmp = ntohl(*p++); /* opaque size */ 345 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) && 346 (tmp != NFS4_DEVICEID4_SIZE + 8)) || 347 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) && 348 (tmp != NFS4_DEVICEID4_SIZE + 4))) { 349 status = htonl(NFS4ERR_INVAL); 350 goto err; 351 } 352 dev->cbd_layout_type = ntohl(*p++); 353 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE); 354 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 355 356 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) { 357 p = read_buf(xdr, sizeof(uint32_t)); 358 if (unlikely(p == NULL)) { 359 status = htonl(NFS4ERR_BADXDR); 360 goto err; 361 } 362 dev->cbd_immediate = ntohl(*p++); 363 } else { 364 dev->cbd_immediate = 0; 365 } 366 367 args->ndevs++; 368 369 dprintk("%s: type %d layout 0x%x immediate %d\n", 370 __func__, dev->cbd_notify_type, dev->cbd_layout_type, 371 dev->cbd_immediate); 372 } 373 out: 374 dprintk("%s: status %d ndevs %d\n", 375 __func__, ntohl(status), args->ndevs); 376 return status; 377 err: 378 kfree(args->devs); 379 goto out; 380 } 381 382 static __be32 decode_sessionid(struct xdr_stream *xdr, 383 struct nfs4_sessionid *sid) 384 { 385 __be32 *p; 386 int len = NFS4_MAX_SESSIONID_LEN; 387 388 p = read_buf(xdr, len); 389 if (unlikely(p == NULL)) 390 return htonl(NFS4ERR_RESOURCE); 391 392 memcpy(sid->data, p, len); 393 return 0; 394 } 395 396 static __be32 decode_rc_list(struct xdr_stream *xdr, 397 struct referring_call_list *rc_list) 398 { 399 __be32 *p; 400 int i; 401 __be32 status; 402 403 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 404 if (status) 405 goto out; 406 407 status = htonl(NFS4ERR_RESOURCE); 408 p = read_buf(xdr, sizeof(uint32_t)); 409 if (unlikely(p == NULL)) 410 goto out; 411 412 rc_list->rcl_nrefcalls = ntohl(*p++); 413 if (rc_list->rcl_nrefcalls) { 414 p = read_buf(xdr, 415 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 416 if (unlikely(p == NULL)) 417 goto out; 418 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls * 419 sizeof(*rc_list->rcl_refcalls), 420 GFP_KERNEL); 421 if (unlikely(rc_list->rcl_refcalls == NULL)) 422 goto out; 423 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 424 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 425 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 426 } 427 } 428 status = 0; 429 430 out: 431 return status; 432 } 433 434 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 435 struct xdr_stream *xdr, 436 struct cb_sequenceargs *args) 437 { 438 __be32 *p; 439 int i; 440 __be32 status; 441 442 status = decode_sessionid(xdr, &args->csa_sessionid); 443 if (status) 444 goto out; 445 446 status = htonl(NFS4ERR_RESOURCE); 447 p = read_buf(xdr, 5 * sizeof(uint32_t)); 448 if (unlikely(p == NULL)) 449 goto out; 450 451 args->csa_addr = svc_addr(rqstp); 452 args->csa_sequenceid = ntohl(*p++); 453 args->csa_slotid = ntohl(*p++); 454 args->csa_highestslotid = ntohl(*p++); 455 args->csa_cachethis = ntohl(*p++); 456 args->csa_nrclists = ntohl(*p++); 457 args->csa_rclists = NULL; 458 if (args->csa_nrclists) { 459 args->csa_rclists = kmalloc_array(args->csa_nrclists, 460 sizeof(*args->csa_rclists), 461 GFP_KERNEL); 462 if (unlikely(args->csa_rclists == NULL)) 463 goto out; 464 465 for (i = 0; i < args->csa_nrclists; i++) { 466 status = decode_rc_list(xdr, &args->csa_rclists[i]); 467 if (status) 468 goto out_free; 469 } 470 } 471 status = 0; 472 473 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u " 474 "highestslotid %u cachethis %d nrclists %u\n", 475 __func__, 476 ((u32 *)&args->csa_sessionid)[0], 477 ((u32 *)&args->csa_sessionid)[1], 478 ((u32 *)&args->csa_sessionid)[2], 479 ((u32 *)&args->csa_sessionid)[3], 480 args->csa_sequenceid, args->csa_slotid, 481 args->csa_highestslotid, args->csa_cachethis, 482 args->csa_nrclists); 483 out: 484 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 485 return status; 486 487 out_free: 488 for (i = 0; i < args->csa_nrclists; i++) 489 kfree(args->csa_rclists[i].rcl_refcalls); 490 kfree(args->csa_rclists); 491 goto out; 492 } 493 494 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 495 struct xdr_stream *xdr, 496 struct cb_recallanyargs *args) 497 { 498 uint32_t bitmap[2]; 499 __be32 *p, status; 500 501 args->craa_addr = svc_addr(rqstp); 502 p = read_buf(xdr, 4); 503 if (unlikely(p == NULL)) 504 return htonl(NFS4ERR_BADXDR); 505 args->craa_objs_to_keep = ntohl(*p++); 506 status = decode_bitmap(xdr, bitmap); 507 if (unlikely(status)) 508 return status; 509 args->craa_type_mask = bitmap[0]; 510 511 return 0; 512 } 513 514 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 515 struct xdr_stream *xdr, 516 struct cb_recallslotargs *args) 517 { 518 __be32 *p; 519 520 args->crsa_addr = svc_addr(rqstp); 521 p = read_buf(xdr, 4); 522 if (unlikely(p == NULL)) 523 return htonl(NFS4ERR_BADXDR); 524 args->crsa_target_highest_slotid = ntohl(*p++); 525 return 0; 526 } 527 528 #endif /* CONFIG_NFS_V4_1 */ 529 530 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 531 { 532 __be32 *p; 533 534 p = xdr_reserve_space(xdr, 4 + len); 535 if (unlikely(p == NULL)) 536 return htonl(NFS4ERR_RESOURCE); 537 xdr_encode_opaque(p, str, len); 538 return 0; 539 } 540 541 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) 542 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) 543 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) 544 { 545 __be32 bm[2]; 546 __be32 *p; 547 548 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); 549 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); 550 if (bm[1] != 0) { 551 p = xdr_reserve_space(xdr, 16); 552 if (unlikely(p == NULL)) 553 return htonl(NFS4ERR_RESOURCE); 554 *p++ = htonl(2); 555 *p++ = bm[0]; 556 *p++ = bm[1]; 557 } else if (bm[0] != 0) { 558 p = xdr_reserve_space(xdr, 12); 559 if (unlikely(p == NULL)) 560 return htonl(NFS4ERR_RESOURCE); 561 *p++ = htonl(1); 562 *p++ = bm[0]; 563 } else { 564 p = xdr_reserve_space(xdr, 8); 565 if (unlikely(p == NULL)) 566 return htonl(NFS4ERR_RESOURCE); 567 *p++ = htonl(0); 568 } 569 *savep = p; 570 return 0; 571 } 572 573 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 574 { 575 __be32 *p; 576 577 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 578 return 0; 579 p = xdr_reserve_space(xdr, 8); 580 if (unlikely(!p)) 581 return htonl(NFS4ERR_RESOURCE); 582 p = xdr_encode_hyper(p, change); 583 return 0; 584 } 585 586 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 587 { 588 __be32 *p; 589 590 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 591 return 0; 592 p = xdr_reserve_space(xdr, 8); 593 if (unlikely(!p)) 594 return htonl(NFS4ERR_RESOURCE); 595 p = xdr_encode_hyper(p, size); 596 return 0; 597 } 598 599 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 600 { 601 __be32 *p; 602 603 p = xdr_reserve_space(xdr, 12); 604 if (unlikely(!p)) 605 return htonl(NFS4ERR_RESOURCE); 606 p = xdr_encode_hyper(p, time->tv_sec); 607 *p = htonl(time->tv_nsec); 608 return 0; 609 } 610 611 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 612 { 613 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 614 return 0; 615 return encode_attr_time(xdr,time); 616 } 617 618 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 619 { 620 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 621 return 0; 622 return encode_attr_time(xdr,time); 623 } 624 625 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 626 { 627 __be32 status; 628 629 hdr->status = xdr_reserve_space(xdr, 4); 630 if (unlikely(hdr->status == NULL)) 631 return htonl(NFS4ERR_RESOURCE); 632 status = encode_string(xdr, hdr->taglen, hdr->tag); 633 if (unlikely(status != 0)) 634 return status; 635 hdr->nops = xdr_reserve_space(xdr, 4); 636 if (unlikely(hdr->nops == NULL)) 637 return htonl(NFS4ERR_RESOURCE); 638 return 0; 639 } 640 641 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 642 { 643 __be32 *p; 644 645 p = xdr_reserve_space(xdr, 8); 646 if (unlikely(p == NULL)) 647 return htonl(NFS4ERR_RESOURCE_HDR); 648 *p++ = htonl(op); 649 *p = res; 650 return 0; 651 } 652 653 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) 654 { 655 __be32 *savep = NULL; 656 __be32 status = res->status; 657 658 if (unlikely(status != 0)) 659 goto out; 660 status = encode_attr_bitmap(xdr, res->bitmap, &savep); 661 if (unlikely(status != 0)) 662 goto out; 663 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 664 if (unlikely(status != 0)) 665 goto out; 666 status = encode_attr_size(xdr, res->bitmap, res->size); 667 if (unlikely(status != 0)) 668 goto out; 669 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 670 if (unlikely(status != 0)) 671 goto out; 672 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 673 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 674 out: 675 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 676 return status; 677 } 678 679 #if defined(CONFIG_NFS_V4_1) 680 681 static __be32 encode_sessionid(struct xdr_stream *xdr, 682 const struct nfs4_sessionid *sid) 683 { 684 __be32 *p; 685 int len = NFS4_MAX_SESSIONID_LEN; 686 687 p = xdr_reserve_space(xdr, len); 688 if (unlikely(p == NULL)) 689 return htonl(NFS4ERR_RESOURCE); 690 691 memcpy(p, sid, len); 692 return 0; 693 } 694 695 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 696 struct xdr_stream *xdr, 697 const struct cb_sequenceres *res) 698 { 699 __be32 *p; 700 __be32 status = res->csr_status; 701 702 if (unlikely(status != 0)) 703 goto out; 704 705 encode_sessionid(xdr, &res->csr_sessionid); 706 707 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 708 if (unlikely(p == NULL)) 709 return htonl(NFS4ERR_RESOURCE); 710 711 *p++ = htonl(res->csr_sequenceid); 712 *p++ = htonl(res->csr_slotid); 713 *p++ = htonl(res->csr_highestslotid); 714 *p++ = htonl(res->csr_target_highestslotid); 715 out: 716 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 717 return status; 718 } 719 720 static __be32 721 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 722 { 723 if (op_nr == OP_CB_SEQUENCE) { 724 if (nop != 0) 725 return htonl(NFS4ERR_SEQUENCE_POS); 726 } else { 727 if (nop == 0) 728 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 729 } 730 731 switch (op_nr) { 732 case OP_CB_GETATTR: 733 case OP_CB_RECALL: 734 case OP_CB_SEQUENCE: 735 case OP_CB_RECALL_ANY: 736 case OP_CB_RECALL_SLOT: 737 case OP_CB_LAYOUTRECALL: 738 case OP_CB_NOTIFY_DEVICEID: 739 *op = &callback_ops[op_nr]; 740 break; 741 742 case OP_CB_NOTIFY: 743 case OP_CB_PUSH_DELEG: 744 case OP_CB_RECALLABLE_OBJ_AVAIL: 745 case OP_CB_WANTS_CANCELLED: 746 case OP_CB_NOTIFY_LOCK: 747 return htonl(NFS4ERR_NOTSUPP); 748 749 default: 750 return htonl(NFS4ERR_OP_ILLEGAL); 751 } 752 753 return htonl(NFS_OK); 754 } 755 756 static void nfs4_callback_free_slot(struct nfs4_session *session) 757 { 758 struct nfs4_slot_table *tbl = &session->bc_slot_table; 759 760 spin_lock(&tbl->slot_tbl_lock); 761 /* 762 * Let the state manager know callback processing done. 763 * A single slot, so highest used slotid is either 0 or -1 764 */ 765 tbl->highest_used_slotid = NFS4_NO_SLOT; 766 nfs4_slot_tbl_drain_complete(tbl); 767 spin_unlock(&tbl->slot_tbl_lock); 768 } 769 770 static void nfs4_cb_free_slot(struct cb_process_state *cps) 771 { 772 if (cps->slotid != NFS4_NO_SLOT) 773 nfs4_callback_free_slot(cps->clp->cl_session); 774 } 775 776 #else /* CONFIG_NFS_V4_1 */ 777 778 static __be32 779 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 780 { 781 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 782 } 783 784 static void nfs4_cb_free_slot(struct cb_process_state *cps) 785 { 786 } 787 #endif /* CONFIG_NFS_V4_1 */ 788 789 #ifdef CONFIG_NFS_V4_2 790 static __be32 791 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 792 { 793 __be32 status = preprocess_nfs41_op(nop, op_nr, op); 794 if (status != htonl(NFS4ERR_OP_ILLEGAL)) 795 return status; 796 797 if (op_nr == OP_CB_OFFLOAD) 798 return htonl(NFS4ERR_NOTSUPP); 799 return htonl(NFS4ERR_OP_ILLEGAL); 800 } 801 #else /* CONFIG_NFS_V4_2 */ 802 static __be32 803 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 804 { 805 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 806 } 807 #endif /* CONFIG_NFS_V4_2 */ 808 809 static __be32 810 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 811 { 812 switch (op_nr) { 813 case OP_CB_GETATTR: 814 case OP_CB_RECALL: 815 *op = &callback_ops[op_nr]; 816 break; 817 default: 818 return htonl(NFS4ERR_OP_ILLEGAL); 819 } 820 821 return htonl(NFS_OK); 822 } 823 824 static __be32 process_op(int nop, struct svc_rqst *rqstp, 825 struct xdr_stream *xdr_in, void *argp, 826 struct xdr_stream *xdr_out, void *resp, 827 struct cb_process_state *cps) 828 { 829 struct callback_op *op = &callback_ops[0]; 830 unsigned int op_nr; 831 __be32 status; 832 long maxlen; 833 __be32 res; 834 835 dprintk("%s: start\n", __func__); 836 status = decode_op_hdr(xdr_in, &op_nr); 837 if (unlikely(status)) 838 return status; 839 840 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", 841 __func__, cps->minorversion, nop, op_nr); 842 843 switch (cps->minorversion) { 844 case 0: 845 status = preprocess_nfs4_op(op_nr, &op); 846 break; 847 case 1: 848 status = preprocess_nfs41_op(nop, op_nr, &op); 849 break; 850 case 2: 851 status = preprocess_nfs42_op(nop, op_nr, &op); 852 break; 853 default: 854 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH); 855 } 856 857 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 858 op_nr = OP_CB_ILLEGAL; 859 if (status) 860 goto encode_hdr; 861 862 if (cps->drc_status) { 863 status = cps->drc_status; 864 goto encode_hdr; 865 } 866 867 maxlen = xdr_out->end - xdr_out->p; 868 if (maxlen > 0 && maxlen < PAGE_SIZE) { 869 status = op->decode_args(rqstp, xdr_in, argp); 870 if (likely(status == 0)) 871 status = op->process_op(argp, resp, cps); 872 } else 873 status = htonl(NFS4ERR_RESOURCE); 874 875 encode_hdr: 876 res = encode_op_hdr(xdr_out, op_nr, status); 877 if (unlikely(res)) 878 return res; 879 if (op->encode_res != NULL && status == 0) 880 status = op->encode_res(rqstp, xdr_out, resp); 881 dprintk("%s: done, status = %d\n", __func__, ntohl(status)); 882 return status; 883 } 884 885 /* 886 * Decode, process and encode a COMPOUND 887 */ 888 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) 889 { 890 struct cb_compound_hdr_arg hdr_arg = { 0 }; 891 struct cb_compound_hdr_res hdr_res = { NULL }; 892 struct xdr_stream xdr_in, xdr_out; 893 __be32 *p, status; 894 struct cb_process_state cps = { 895 .drc_status = 0, 896 .clp = NULL, 897 .slotid = NFS4_NO_SLOT, 898 .net = SVC_NET(rqstp), 899 }; 900 unsigned int nops = 0; 901 902 dprintk("%s: start\n", __func__); 903 904 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 905 906 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 907 xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 908 909 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 910 if (status == __constant_htonl(NFS4ERR_RESOURCE)) 911 return rpc_garbage_args; 912 913 if (hdr_arg.minorversion == 0) { 914 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident); 915 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) 916 return rpc_drop_reply; 917 } 918 919 cps.minorversion = hdr_arg.minorversion; 920 hdr_res.taglen = hdr_arg.taglen; 921 hdr_res.tag = hdr_arg.tag; 922 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) 923 return rpc_system_err; 924 925 while (status == 0 && nops != hdr_arg.nops) { 926 status = process_op(nops, rqstp, &xdr_in, 927 argp, &xdr_out, resp, &cps); 928 nops++; 929 } 930 931 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 932 * resource error in cb_compound status without returning op */ 933 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 934 status = htonl(NFS4ERR_RESOURCE); 935 nops--; 936 } 937 938 *hdr_res.status = status; 939 *hdr_res.nops = htonl(nops); 940 nfs4_cb_free_slot(&cps); 941 nfs_put_client(cps.clp); 942 dprintk("%s: done, status = %u\n", __func__, ntohl(status)); 943 return rpc_success; 944 } 945 946 /* 947 * Define NFS4 callback COMPOUND ops. 948 */ 949 static struct callback_op callback_ops[] = { 950 [0] = { 951 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 952 }, 953 [OP_CB_GETATTR] = { 954 .process_op = (callback_process_op_t)nfs4_callback_getattr, 955 .decode_args = (callback_decode_arg_t)decode_getattr_args, 956 .encode_res = (callback_encode_res_t)encode_getattr_res, 957 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 958 }, 959 [OP_CB_RECALL] = { 960 .process_op = (callback_process_op_t)nfs4_callback_recall, 961 .decode_args = (callback_decode_arg_t)decode_recall_args, 962 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 963 }, 964 #if defined(CONFIG_NFS_V4_1) 965 [OP_CB_LAYOUTRECALL] = { 966 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall, 967 .decode_args = 968 (callback_decode_arg_t)decode_layoutrecall_args, 969 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 970 }, 971 [OP_CB_NOTIFY_DEVICEID] = { 972 .process_op = (callback_process_op_t)nfs4_callback_devicenotify, 973 .decode_args = 974 (callback_decode_arg_t)decode_devicenotify_args, 975 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 976 }, 977 [OP_CB_SEQUENCE] = { 978 .process_op = (callback_process_op_t)nfs4_callback_sequence, 979 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, 980 .encode_res = (callback_encode_res_t)encode_cb_sequence_res, 981 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 982 }, 983 [OP_CB_RECALL_ANY] = { 984 .process_op = (callback_process_op_t)nfs4_callback_recallany, 985 .decode_args = (callback_decode_arg_t)decode_recallany_args, 986 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 987 }, 988 [OP_CB_RECALL_SLOT] = { 989 .process_op = (callback_process_op_t)nfs4_callback_recallslot, 990 .decode_args = (callback_decode_arg_t)decode_recallslot_args, 991 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 992 }, 993 #endif /* CONFIG_NFS_V4_1 */ 994 }; 995 996 /* 997 * Define NFS4 callback procedures 998 */ 999 static struct svc_procedure nfs4_callback_procedures1[] = { 1000 [CB_NULL] = { 1001 .pc_func = nfs4_callback_null, 1002 .pc_decode = (kxdrproc_t)nfs4_decode_void, 1003 .pc_encode = (kxdrproc_t)nfs4_encode_void, 1004 .pc_xdrressize = 1, 1005 }, 1006 [CB_COMPOUND] = { 1007 .pc_func = nfs4_callback_compound, 1008 .pc_encode = (kxdrproc_t)nfs4_encode_void, 1009 .pc_argsize = 256, 1010 .pc_ressize = 256, 1011 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 1012 } 1013 }; 1014 1015 struct svc_version nfs4_callback_version1 = { 1016 .vs_vers = 1, 1017 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1018 .vs_proc = nfs4_callback_procedures1, 1019 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1020 .vs_dispatch = NULL, 1021 .vs_hidden = 1, 1022 }; 1023 1024 struct svc_version nfs4_callback_version4 = { 1025 .vs_vers = 4, 1026 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1027 .vs_proc = nfs4_callback_procedures1, 1028 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1029 .vs_dispatch = NULL, 1030 .vs_hidden = 1, 1031 }; 1032